package com.jf.cloud.service.sysmanager.common.util;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.security.SecureRandom;

/** 
 * 字符串加密解密处理
 */

public class SecurityEncoder {

	private static final String PASSWORD_CRYPT_KEY = "com.juedingrenfeng.www";
	private final static String DES = "DES";

	/** 
	 * 加密 
	 */

	public static byte[] encrypt(byte[] src, byte[] key) throws Exception {

		//DES算法要求有一个可信任的随机数源 

		SecureRandom sr = new SecureRandom();

		// 从原始密匙数据创建DESKeySpec对象 

		DESKeySpec dks = new DESKeySpec(key);

		// 创建一个密匙工厂，然后用它把DESKeySpec转换成 

		// 一个SecretKey对象 

		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);

		SecretKey securekey = keyFactory.generateSecret(dks);

		// Cipher对象实际完成加密操作 

		Cipher cipher = Cipher.getInstance(DES);

		// 用密匙初始化Cipher对象 

		cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);

		// 现在，获取数据并加密 

		// 正式执行加密操作 

		return cipher.doFinal(src);

	}

	/** 

	* 解密 

	* @param src 数据源 

	* @param key 密钥，长度必须是8的倍数 

	* @return   返回解密后的原始数据 

	* @throws Exception

	*/

	public static byte[] decrypt(byte[] src, byte[] key) throws Exception {

		// DES算法要求有一个可信任的随机数源 

		SecureRandom sr = new SecureRandom();

		// 从原始密匙数据创建一个DESKeySpec对象 

		DESKeySpec dks = new DESKeySpec(key);

		// 创建一个密匙工厂，然后用它把DESKeySpec对象转换成 

		// 一个SecretKey对象 

		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);

		SecretKey securekey = keyFactory.generateSecret(dks);

		// Cipher对象实际完成解密操作 

		Cipher cipher = Cipher.getInstance(DES);

		// 用密匙初始化Cipher对象 

		cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

		// 现在，获取数据并解密 

		// 正式执行解密操作 

		return cipher.doFinal(src);

	}

	/** 
	 * 密码解密 
	 */

	public final static String decode(String data) {
		try {
			return new String(decrypt(hex2byte(data.getBytes()),PASSWORD_CRYPT_KEY.getBytes()));
		} catch (Exception e) {
           e.printStackTrace();
		}
		return null;

	}

	/** 
	 * 密码加密 
	 */

	public final static String encode(String password) {
		try {
			return byte2hex(encrypt(password.getBytes(), PASSWORD_CRYPT_KEY.getBytes()));
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;

	}

	/** 

	 * 二行制转字符串 

	 * @param b 
	 * @return 

	 */

	public static String byte2hex(byte[] b) {

		String hs = "";

		String stmp = "";

		for (int n = 0; n < b.length; n++) {

			stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));

			if (stmp.length() == 1)

				hs = hs + "0" + stmp;

			else

				hs = hs + stmp;

		}

		return hs.toUpperCase();

	}

	public static byte[] hex2byte(byte[] b) {

		if ((b.length % 2) != 0)

			throw new IllegalArgumentException("长度不是偶数");

		byte[] b2 = new byte[b.length / 2];

		for (int n = 0; n < b.length; n += 2) {

			String item = new String(b, n, 2);

			b2[n / 2] = (byte) Integer.parseInt(item, 16);

		}
		return b2;
	}
	/**
	 * TODO   订单安全支付 token
	 */
	public static String getKey(long userId){
		return encode(System.currentTimeMillis()+"="+userId);
	}
	public static boolean checkKey(String token, long userId){
		 String tokenStr = decode(token);
		 if(tokenStr.contains("=") && tokenStr.split("=")[1].equals(userId+"") ){
			  if(System.currentTimeMillis() - Long.parseLong(tokenStr.split("=")[0])<=1*60*60*1000){
				   return true;
			  }
		 }
		 return false;
	}
}